Laboratory Evaluation of Field Produced Hot Mix Asphalt Containing Post-Consumer Recycled Asphalt Shingles and Fractionated Recycled Asphalt Pavement

摘要

The research presented in this paper studies the effects of post- consumerrnrecycled asphalt shingles (RAS) on the performance of HMA and its compatibilityrnwith fractionated recycled asphalt pavement (FRAP). In the summer of 2009, a fieldrndemonstration project was conducted by the Illinois Tollway Authority on InterstaternHighway I-90. Eight mix designs containing zero and five percent RAS and varyingrnpercentages of FRAP were developed and placed in the pavement shoulder.rnProduction and laboratory samples of the mixes were obtained for dynamic modulusrntesting, beam fatigue testing, fracture energy testing, binder extraction, andrnsubsequent characterization. From the dynamic modulus testing, master curves werernconstructed to determine how the behavior of the asphalt materials containing RASrndiffered from the behavior of the asphalt materials not containing RAS when varyingrnpercentages of FRAP were a part of the mix designs. From the extracted binders, arnsuite of Superpave tests was conducted at different temperatures and frequencies tornbuild master curves for analyzing how the addition of RAS binder affected thernrheological properties of the mix binder blend. Fracture energy testing wasrnconducted using the disk-shaped compact tension test to estimate thermal crackingrnpotential. Laboratory test results indicate that the mixes containing five percent RASrnwith less than 40 percent recycled materials exhibit an increased resistance tornpermanent deformation while maintaining satisfactory performance in fatigue andrnlow temperature cracking. Although the low temperature binder performance gradernincreased with the addition of recycled materials, the mix performance test resultsrndid not follow that trend, indicating that fibers in the RAS materials likelyrncontributed to the performance of the mixtures.